If you can keep the temp of your flower room at a steady 65* there is no need. In my flower room the (2) 600 watters keep it at 70 even with the room AC on.

From what I've read, if your res temps get up over 68 to 70, you'll have problems. The cooler the better. It's my understanding that the roots have maximum o2 intake when the water temp is 66 to 68 degrees.

Trust me, I didnt like dropping 400 on it but it is essential in my situation.